Search

CN-122010493-A - Carbon-fixation lightweight aggregate anti-cracking concrete and preparation method thereof

CN122010493ACN 122010493 ACN122010493 ACN 122010493ACN-122010493-A

Abstract

The invention discloses a carbon-fixing lightweight aggregate anti-cracking concrete, which is prepared from cement, fly ash, mineral powder, reinforced modified carbon-fixing lightweight aggregate, coarse aggregate, fine aggregate, water and an additive, wherein the reinforced modified carbon-fixing lightweight aggregate is prepared by granulating, carbonizing and curing low-carbon cement, regenerated micro powder, desulfurized petroleum coke slag powder, silt powder, dust-collecting stone powder and water serving as main raw materials, and then modifying reinforced modified liquid formed by phosphate starch, emulsion powder, xanthan gum, polyethylene glycol and fatty alcohol polyoxyethylene ether. The reinforced modified carbon-fixing lightweight aggregate combines the carbon-fixing lightweight aggregate based on low-carbon cement and various solid wastes with the reinforced modification component, can give consideration to good water absorption, water retention and other performances, can effectively improve the compactness, deformation resistance and other performances of a concrete structure when applied to preparing the concrete, gives consideration to good mechanical properties, durability, obvious economic and environmental effects, and has wide applicability.

Inventors

  • LI YEQING
  • MA LI
  • WANG YUNYAO
  • YU SONGBAI
  • Zheng Binhao
  • JIANG SONGTAO
  • LIU HEHE

Assignees

  • 华新建材集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260213

Claims (10)

  1. 1. The anti-cracking concrete is characterized by comprising, by weight, 170-260 parts of cement, 30-90 parts of fly ash, 40-90 parts of mineral powder, 100-500 parts of reinforced modified carbon-fixing lightweight aggregate, 500-1200 parts of coarse aggregate, 800-1000 parts of fine aggregate, 160-180 parts of water and 3-10 parts of additive, wherein the reinforced modified carbon-fixing lightweight aggregate is prepared by granulating low-carbon cement, regenerated micro powder, desulfurized petroleum coke slag powder, silt powder, dust-collecting stone powder and water serving as main raw materials, carbonizing and curing under the conditions of pressurization and heating to obtain the carbon-fixing lightweight aggregate, and then modifying the carbon-fixing lightweight aggregate by using reinforced modified liquid formed by phosphate starch, emulsion powder, xanthan gum, polyethylene glycol and fatty alcohol polyoxyethylene ether.
  2. 2. The carbon-fixed lightweight aggregate crack resistant concrete according to claim 1, wherein the reinforced modified carbon-fixed lightweight aggregate has a particle diameter of 5-16mm and an apparent density of 1100-1400kg/m 3 .
  3. 3. The carbon-fixed lightweight aggregate crack-resistant concrete according to claim 1, wherein the carbon-fixed lightweight aggregate is prepared from the raw materials of (30-60), (20-50), (5-20), (10-30) and (10-20) by weight of low-carbon cement, regenerated micro powder, desulfurized petroleum coke slag powder, silt powder, dust-collecting stone powder and water.
  4. 4. The carbon-fixed lightweight aggregate crack-resistant concrete according to claim 1, wherein the carbonization curing step comprises introducing CO 2 -containing gas with a concentration of 20-99.9vol%, and carbonizing and curing for 8-24 hours under a pressure of 0.05-0.3MPa, a humidity of 60-95% and a temperature of 50-90 ℃.
  5. 5. The carbon-fixed lightweight aggregate anti-cracking concrete according to claim 1, wherein the mass ratio of the phosphate starch, the latex powder, the xanthan gum, the polyethylene glycol and the fatty alcohol-polyoxyethylene ether in the reinforcing modification liquid is (3-6): (2-5): (1-3): (1-2): (0.1-0.5), and the total concentration of the obtained reinforcing modification liquid is 10-30wt%.
  6. 6. The carbon-fixed lightweight aggregate crack-resistant concrete according to claim 1, wherein the modification step of reinforcing the modifying liquid adopts a soaking process, and the soaking time is 12-48h.
  7. 7. The carbon-fixed lightweight aggregate anti-cracking concrete according to claim 1, wherein the low-carbon cement takes C 2 S、C 3 S 2 and CS as main mineral phases, wherein C 2 S accounts for more than 70%, 45 μm screen residue is less than 20%, specific surface area is more than 330m 2 /kg, regenerated micro powder is micro powder produced when waste construction waste is crushed to prepare regenerated aggregate, caCO 3 content is more than 40%,45 μm screen residue is less than 30%, specific surface area is more than 280m 2 /kg, desulfurized petroleum coke powder is a product of high-sulfur petroleum coke after desulfurization by lime desulfurization technology, caO content is more than 45%, caSO 4 content is more than 38%,45 μm screen residue is less than 40%, specific surface area is more than 200m 2 /kg, silt powder is obtained by dredging silt powder, specifically silt produced by dredging a river channel or a lake bottom, siO 2 content is more than 60%, al 49 content is more than 20%,45 μm screen residue is less than 35%, specific surface area is more than 250m 2 /kg, dry sand stone powder is more than 30%, and dry sand and specific surface area is more than 40.40% and the specific surface area is more than 40.40.30% and the specific surface area is more than 300.40%.
  8. 8. The carbon-fixed lightweight aggregate anti-cracking concrete according to claim 1, wherein the cement is ordinary Portland cement, the grade P.O42.5 is more than, the fly ash is fly ash of grade II or more, the mineral powder is mineral powder of S95 or more, the coarse aggregate comprises ordinary coarse aggregate with the particle size of 5-16mm and 16-31.6mm, the water absorption and the mud content are both less than 1%, the crushing value is less than 12%, the fine aggregate is machine-made sand with the particle size of 0-5mm, the fineness modulus is 2.6-3.2, the MB value is less than 0.75, the stone powder content is 5-10wt% and the crushing value is less than 18%.
  9. 9. The carbon-fixed lightweight aggregate crack resistant concrete according to claim 1, wherein the admixture is a water reducing agent.
  10. 10. The method for preparing the carbon-fixed lightweight aggregate anti-cracking concrete according to any one of claims 1-9 is characterized by comprising the following steps of sequentially adding the weighed coarse aggregate, fine aggregate, cement, fly ash and mineral powder into a stirrer, stirring and mixing uniformly, then adding water and stirring uniformly, and then adding the reinforced modified carbon-fixed lightweight aggregate and a water reducer and stirring uniformly to obtain the carbon-fixed lightweight aggregate anti-cracking concrete.

Description

Carbon-fixation lightweight aggregate anti-cracking concrete and preparation method thereof Technical Field The invention belongs to the technical field of building materials, and particularly relates to carbon-fixing lightweight aggregate anti-cracking concrete and a preparation method thereof. Background The carbon dioxide mineralization curing building material technology can effectively reduce high energy consumption brought by the traditional curing process while playing a huge carbon fixation potential, is beneficial to improving the performance of the building material, shortening the curing period of the building material and absorbing a great amount of industrial solid waste, and has good environmental benefit and economic benefit. Currently, with the gradual limitation of natural sand aggregate extraction, ‌ has driven a significant rise in the demand for artificial aggregates. The traditional sintering aggregate has high energy consumption, and meanwhile, the clay which is a non-renewable resource is required to be used as a raw material, so that the traditional sintering aggregate is gradually eliminated. The porous low-density characteristic of the lightweight aggregate is beneficial to remarkably reducing the dead weight of a concrete-based building, and has wide application in construction fields such as high-rise buildings, large-span bridges, poor foundation conditions and the like. At present, the lightweight aggregate is used for preparing concrete, when the mixing amount is high, the concrete has poor workability, obvious strength reduction and poor early cracking relieving effect, after the lightweight aggregate is modified, the cost is high, the introduced impurities are difficult to control, the strength and the durability of the concrete are easily influenced, and the early cracking inhibiting effect is poor. Disclosure of Invention The invention mainly aims to solve the problems and the defects existing in the prior art and provide the carbon-fixing lightweight aggregate anti-cracking concrete and the preparation method thereof, which can realize high added value utilization of various solid wastes and play a good role in alleviating concrete cracking while absorbing and fixing carbon dioxide waste gas. In order to achieve the above purpose, the technical scheme adopted by the invention comprises the following steps: The reinforced modified carbon-fixing lightweight aggregate is prepared from (by weight) cement 170-260 parts, fly ash 30-90 parts, mineral powder 40-90 parts, reinforced modified carbon-fixing lightweight aggregate 100-500 parts, coarse aggregate 500-1200 parts, fine aggregate 800-1000 parts, water 160-180 parts and water reducing agent 3-10 parts, wherein the reinforced modified carbon-fixing lightweight aggregate is prepared by granulating low-carbon cement, regenerated micropowder, desulfurized petroleum coke slag powder, silt powder, dust-collecting stone powder and water as main raw materials, carbonizing and curing under the conditions of pressurization and heating to obtain carbon-fixing lightweight aggregate, and then modifying the carbon-fixing lightweight aggregate by adopting modified liquid formed by phosphate starch, latex powder, xanthan gum, polyethylene glycol and fatty alcohol polyoxyethylene ether. Further, the cement is ordinary Portland cement with the P.O42.5 grade or more, the fly ash is the fly ash with the II grade or more, and the mineral powder is the mineral powder with the S95 grade or more. In the scheme, the coarse aggregate comprises common coarse aggregate (crushed stone) with the particle size of 5-16mm and 16-31.6mm, the water absorption rate and the mud content are both less than 1%, and the crushing value is less than 12%. Further, the content of the common coarse aggregate with the grain diameter of 5-16 mm and the common coarse aggregate with the grain diameter of 16-31.6mm in the carbon-fixed lightweight aggregate anti-cracking concrete are respectively 0-400 parts and 500-800 parts. In the scheme, the particle size of the carbon-fixed lightweight aggregate is 5-16mm, and the apparent density is 1100-1400kg/m 3. Further, the carbon-fixing lightweight aggregate adopts the raw materials of (30-60), (20-50), (5-10), (5-20), (10-30), (10-20) and (30-20) of low-carbon cement, regenerated micropowder, desulfurized petroleum coke slag powder, silt powder, dust-collecting stone powder and water. Further, the concrete preparation steps of the carbon-fixing lightweight aggregate comprise the steps of uniformly stirring the weighed low-carbon cement, the reclaimed micro powder, the desulfurized petroleum coke slag powder, the silt powder, the dust-collecting stone powder and the water, granulating (adopting a disc granulator and other modes), introducing CO 2 -containing gas with the concentration of 20-99.9vol%, and carbonizing and modifying for 8-24 hours under the pressure of 0.05-0.3MPa, the humidity of 60-95% and the temperature of 50-9